Toroidal winding machine



June 24, 1969 I F. JAGOS 3,451,632

TOROIDAL WINDING MACHINE Filed Nov. 5, 1966 Fly- 3 INVENTOR.

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BY WWW United States Patent 3,451,632 TOROIDAL WINDING MACHINE FrantisekJagos, Prague, Czechoslovakia, assignor to TESLA Narodni podnik, Prague,Czechoslovakia Filed Nov. 3, 1966, Ser. No. 591,876 Claims priority,application Czechoslovakia, Nov. 12, 1965, 6,759/65 Int. Cl. B65h 81/04U.S. Cl. 242-4 4 Claims ABSTRACT OF THE DISCLOSURE A shuttleless machinefor providing a toroidal core winding. A plurality of conductor loopswhich initially extend through the toroidal core are released to bepulled onto the core by an electric drive mechanism. The conductor isguided between a pair of jaws one of which is pressed toward the otherso that by way of these guide jaws the conductor is maintained undertension while being applied to the toroidal core. In addition, in theelectric drive mechanism there is an electric driving motor connectedinto a circuit which includes a resistor and a switch for connecting theresistor into and out of the motor circuit, the motor running at aslower speed when the resistor is connected into the circuit. The switchis cam-controlled by a cam means which closes the switch when a looseconductor loop is released so that in this way the conductor loops aregently and continuously applied to the toroidal core.

The invention relates to a depositing device for a conductor to be woundby a shuttleless winding machine on a microtoroid core.

A microtoroid coil winding machine has already been disclosed operatingin the following manner: A conductor which is to be wound on a toroidalring-shaped core is prewound in several turns on two rollers in the required length and it is carried by these rollers so that it passes alsothrough the toroidal core on which a coil is being wound. Between thefirst prewound turn and the supply of the conductor there is created agap which permits to separate and to lift the wound conductor in such amanner that a carrier in the form of a roller catches the free end ofthe wound conductor, lifts it from a driven roller and a driving rollerand directs it in the direction from the driven roller to the toroidwhereby a new turn is always formed on the toroid held in a holder ofcommon construction and the conductor is directed to its place on thetoroid by a discriminating device comprising two strings. The windingdevice is driven by an electromotor over an adjustable frictioncoupling. A construction of this general type is disclosed in BritishPatent 911,622, the complete specification of which was published Nov.28, 1962.

When the known discriminating device comprising two strings is used, theconductor is easily broken on the edge of the toroid core. This is dueto the fact that while lifting the conductor from a carrier, the carrierforms a loose loop which cannot be introduced by the discriminatingdevice accurately to such a degree that the conductor is placeduniformly on the toroid core. This device does not permit braking of thefree conductor.

It is a general object of the invention to eliminate the above mentioneddrawbacks of the known state of art and to create for the conductor adepositing device which prevents the conductor which has been liftedfrom the carrier to form a loose loop which causes interruption of theconductor after the latter has been tensioned again.

In accordance with the invention the depositing device for a conductorto he wound by a shuttleless winding machine on a microtoroid core ischaracterized by the fact 3,451,632 Patented June 24, 1969 that itcomprises two jaws pressed against each other by an adjustable force andprovided with a guiding surface for the conductor guided therebetween,and that it further comprises a braking device for slowing down theconductor to be wound on the core, the braking device being set intooperation as soon as the guided conductor is released by the carrier.The braking device comprises a resistor in the circuit of the electricdriving motor of the winding machine, the position of the resistor inthe circuit being controlled by a cam controlled switch. The angularposition of the cam is derived from the angular position of the carrier.

The invention will be best understood from the following specificationto be read in conjunction with the accompanying drawing illustrating apreferred example of embodiment. In the drawing:

FIG. 1 is a schematic elevational view of the device in accordance withthe invention,

FIG. 2 is a plan view, and

FIG. 3 explains in more detail the braking device.

Referring now more particularly to FIGS. 1 and 2, it can be seen thatthe depositing device in accordance with the invention comprises twoconveniently shaped jaws 1 and 2 each having a straight portion pressedagainst the straight portion of the other jaw by a spring 3. The shapeof the jaws 1 and 2 is such that they form almost on their entirecircumference a guiding surface 4 for the conductor 5 which is guided:between these jaws before completion of each turn. The conductor 5 tobe wound on the toroid core 6 is reliably guided between the two jawswhich are elastic-ally pressed one to the other and which are arrangedin the close vicinity of the conductor 5 and it is also braked by asuitably adjusted pressure derived from the adjustable spring 3.

FIG. 2 shows a conductor supply 7 and a part 8 of the conductor 5 whichhas just been wound on the toroid core 6.

When the conductor 5 passes between the jaws 1, 2 and when it becomestensioned on the toroid core 6 a resistor 12, for example of thevariable type, is switched into the circuit of the electric drivingmotor 11 by means of a switch 10 controlled by a cam 9. The drivingmotor 11 drives the mechanism which moves the carrier from which theconductor loops are released to be drawn also by way of a drive from themotor 11 onto the core 6. The carrier moves along a predetermined pathand will release the conductor loops at a given moment corresponding tothe moment when the cam means 9 has an angular position bringing aboutthe closing of the switch 10 so as to connect the variable resistor 12into the circuit driving motor 11. This reduces the speed of theelectric motor in the period of control and tensioning of the conductor.Thus the conductor is tensioned on the toroidal core continually andsoftly. The cam 9 is mounted so that its angular position at any momentis controlled by the angular position of the carrier of the conductor.At the moment when the carrier releases the conductor 5 for winding onthe toroid core 6, the cam switches in the contact 10.

The pair of jaws 1 and 2 form a friction means for frictionally engagingand guiding the conductor loops as they are drawn onto the core 6. Thesupply 7 of conductor loops initially extends through the core 6 so thatas these loops are released to be drawn onto the core in response to theoperation of the motor 11, the friction means 1, 2 will act to maintainthe loops under tension. The force of the friction means is adjusted byway of the adjustable spring means 3 which urges the jaw 2 toward thejaw 1. The electric driving motor 11 is connected into the electricalcircuit, shown in FIG. 3, which includes the variable resistor 12capable of being connected into and disconnected from the circuit of themotor 11 by the switch 10. The cam 9 forms a cam means for controllingthe switch 10 to connect the resistor 12 into the circuit of the drivingmotor 11 in response to the winding of the loose loops onto the core 6,so that in this way the speed of the motor 11 is reduced when the looseloops are applied to the core, thus achieving a continuous gentleapplication of the conductor windings to the core.

What we claim is:

1. In a machine for the shuttleless winding of toroidal cores, anelectric driving motor, friction means for frictionally engaging andguiding conductor loops as they are drawn onto a toroidal core inresponse to the action of said driving motor, an electric circuit inwhich said motor is located, said circuit including a resistor and aswitch for connecting said resistor into and out of the circuit of themotor to reduce the speed of the latter when the resister is connectedinto the circuit, and cam means coacting with said switch forcontrolling the latter to connect said resistor into said circuit whenloose conductor loops are drawn onto the toroidal core by the action ofsaid motor, whereby the speed of said motor is reduced to achieve withsaid friction means a continuous, gentle depositing of the loops on thecore.

2. The combination of claim 1 and wherein said friction means includes apair of jaws between which the conductor loops are guided, and springmeans coaeting with one of said jaws for urging it toward the other;

3. The combination of claim 2 and wherein said spring means isadjustable.

4. The combination of claim 1 and wherein said resistor is a variableresistor.

References Cited UNITED STATES PATENTS 2,758,795 8/1956 Hoffman 242-43,000,580 9/ 1961 Matovich 242-4 FOREIGN PATENTS 1,337,547 8/1963France.

BILLY S. TAYLOR, Primary Examiner.

